Run results for: Deep merge: lodash vs ramda vs Object spread

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/133.0.0.0 Safari/537.36

Browser: Chrome 133

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: one year ago

Benchmark engine: Benchmark.js

object spread deep merge

4.6M/s

ramda deep merge

1.1M/s

lodash deep merge

530K/s

View exact numbers

Test name	Executions per second
✓ object spread deep merge	4,576,782 Ops/sec
ramda deep merge	1,139,690 Ops/sec
lodash deep merge	530,019 Ops/sec

HTML Preparation code:

<script src="https://cdnjs.cloudflare.com/ajax/libs/ramda/0.25.0/ramda.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.21/lodash.min.js"></script>

Tests:

lodash deep merge
const a = { a: { c: { e: { h:4 }, f: 3 }, d: 2 }, b: 1 }; const b = { a: { c: { e: { g: true } } } }; const c = _.merge(a, b)
ramda deep merge
const a = { a: { c: { e: { h:4 }, f: 3 }, d: 2 }, b: 1 }; const b = { a: { c: { e: { g: true } } } }; const c = R.mergeDeepRight(a, b);
object spread deep merge
const a = { a: { c: { e: { h:4 }, f: 3 }, d: 2 }, b: 1 }; const b = { a: { c: { e: { g: true } } } }; const c = {...a, ...b, a: { ...a.a, ...b.b, c: { ...a.a.c, ...b.a.c, e: { ...a.a.c.e, ...b.a.c.e } } } };